Feed for pneumatic tools.



. M. HARDSOGG.

FEED FOB. PNEUMATIC TOOLS.

APPLIUATION FILED un. 2,1901.

Patented Dec. 7, 1909. 2 SHEETS-SHEET l.

DVGI nfl Muni mc w.

. ma S M. HARDSOGG. FEED Pon PNEUMATIQ TooLs. APPLICATION FILED APILZ, 1907. 942,066, Patented Dec. 7, 1909.

2 SHEETS-SHEET 2.

UNITED STATES PATENT oEEicE.

MARTTN HARDsocG, or OTTUMWA, IOWA FEED FOR iPNEUMATIC TOOLS.

To all whom it may concern:

o Be it. known that I, MARTIN H iimsocc, a citizen of the United States, residing at Ottumwa, in the county of Tapello and State of Iowa, have invented certain new and useful Improvements in Feeds'for Pneumatic Tools, of which the following is a specification.

It. is desirable, in the operation of pneumatic tools, particularly pneumatic drills, to have presentI a ready means for feeding forward the tool with its operating hammer, and for withdrawing the tool and its operating hammer and other parts connected therewith. v

The objects of the present invention are to feed or advance the hammer and the operating tool, with the surrounding casing, by the pressure of the driving medium for the hammer, so that the driving medium for the hammer will serve the double purpose of operating the hammer and of feeding forward or advancing the hammer and tool; to enable a medium under pressure for operating the hammer and tool to be utilized in withdrawing the hammer tool and connected parts; to furnish a fixed tube, for supplying compressed air, or other medium under pressure, to operate the hammer, with a cross head and packing rings encircling its forward end and coacting with a surroundling tube, for the cross head and packing rings to furnish an abutment againstl which the admitted medium under preure will act to feed forward or advance the hammer, the operating tool and the tube carrying the hammer and encircling the medium under pressure supply tube; to furnish a iixed outer tube or casing, which casing surrounds the tube carrying the hammer and operating tool, which tube has, adjacent to its outer end. between its wall and the wall of the hammer tube, a head or cross wall to serve as an abutment to coact with a piston or packing ring on the inner or hammer tube, and furnish a. chamber into which compressed air, or other medium under pressure, can be forced and a'ctto withdraw the hammer and tool and the parts connected therewith; to enablecompressed air. oi; other medium under pressure, to be utilized in operating the hammer, feeding forward the hammer and tool and the parts connected Specication of Letters Patent.

Patented Dec. i909.

Application led April 2, 1907. Serial No. 366,032.

therewith, and withdrawing the hammer and the tool and the parts connected therewith in the operation of the drill, or other tool or appliance; and to improve generally the construction and arrangement of the parts by which the'utilization of compressed air, or other medium under pressure, is obtained in operating the pneumatic hammer, the tool and'the parts connected with the hammer. u

rlhe invention consists in the features of construction and combinations of parts hereinafter described and claimed. y

ln the drawing, Figure l is a cent-ral lonf gitudinal section of the outer casing or tube and the hammer carrying and feed tube, and

` the pressure medium supply tube, showing the cross heads or walls and the packing rings forming the abutments and theJ rotary means foil the hammer carrying and feed tube also in section, with the hammer frame and tool in fullelevation; Fig. 2 a. similar View to Fig. 1, showingthe hammer frame with a single spiral instead of a double spiral, and omitting the lrotating means for thehammer tube; Fig. 3 a face view of a cup leather packing ring; Fig. 4 a sectional elevationof the ring of Fig.` 3; Fig. 5 aI sectional plan View of the outer casing, the tube carrying the tool, the tube for the medium under pressure, and the driving gear, on an enlarged scale as compared with Fig.

l; Fig. t3 a side elevation, showing the supi port for the rear end of the mechanism; Fig. 7 a frontelevation, partly 1n section,

of the support and parts shown in Fig. t3;

and Fig. 8 a detail, partly in section, showing the operating tool and an outer tube or casing for insertion as a backing for the drilled hole.

rllhe feed mechanism is shown in connection with a hammer frame, either with a single spiral or a double spiral on its exterior, in connection with a drill head carrying bits or cutters, but it is to be understood that the feed mechanism is applicable for use with other types of hammer frames, and other tools or instruments than a drill head with bits or cutters. The drill shown has a head with a plurality of bits or cutters, but` other forms of bits r cutters could be used. Upon the outer end of the drill head is an outer or end bit or cutter l, and interme- .head has a lurality diate loits or cutters 2, and 3, so that the of bits or cutters. The head 4g is o a shape, as to length and width, to receive the bits `or cutters, and, as shown, the head has a cross hole 5 to facilitate the removal from the head of the bit or cutter in line with the shank or stem of the head.

The head' has a shank 6 to enter the chamber of a barrel 7, forthe shank to constitute a driven stem or shank; and the shank is held, so as to have a limited end play in the chamber of the barrel 7, by a key a vse-y cured in the -wall of the barrel and passing through a slot in the shank, shown by dotted lines in Fig. 2,

which key prevents the head from falling out in theoperation of the drill.

@The frame has, circumferentially extending around the barrel 7, two spiral flanges 8, as shown in Fig. 1, or a single spiral ange 8, as shown in Fig. 2. Eachspiral flange has passages 9, as shown by. dotted lines in Figs. 1 and 2, and a port b, and a cross passage c opening into said passage 9, as shown in Fig.'8. All of these parts are in communication with the chamber of the barrel for inducting and educting a fluid or.

medium under pressure to operate the hammer within the barrel; and the spiral passages are each connected by a tube 10 with a hole in the drill head, as shown by dotted lines in Figs. 1 and 2.

The spiral flange of Fig. 1, and the spiral l, flange of Fig. 2, have a projection 11 forming a shoulder 12, which v the spiral flanges-extending around rel ,7.

movable tube 15,

shoulder furnishes a rest for an outer tube or casing d, as

shown in'Fig. 8, which is used as a backing sure to the tool, and has on its exterior spiral flanges 16 forming a conveyer or lightto coact with the spiral flanges or iange of the Yframe Iin removing the cuttings, dust and fine particles from around the bits or cut ters at the front of the drill head. y

A revoluble supply tube 17 for a .medium under pressure is entered into the inner tube endwise movement head or .abutment 18,

15, and is heldin a lfixed relation against with its outer end' connected to a hose or other conductor leading fromf a source of supply foricompressed air, or other medium under pressure. The forward end of the supply tube has a cross formed or secured a chamber ,19 between thereon and formin glie closing plug 13, into which chamber compressed air, or other medium under pressure, is discharged to act against the end face of the closing plug and feed forward the hammer frame and tool, and to Supply the medium under pressure to the barrel of the hammer frame for operating the hammer in the barrel, which chamber 19 increases in length as the drill gradually advances, carrying with it the inner or feed and hammer carryin tube 15 which is attached to the closing p ug 13, so that the hammer, the drill head with its bits or cutters, and the inner or feed and hammer carrying tube 15 all move as one. The forward or discharge end of the supply tube 17 rearward of the.cross head or abutment 18, is encircled by a plurality of packing rings 20, each consisting of an outer wall 21, au inner 'wall 22, with a chamber 23 between the walls, and a hole or opening 24 within the inner wall for the passage of the tube 17; and each packin ring is held in place by the medium un er pressure entering the chamber 23 which acts and expands and holds the walls 21 and 22 in close contact with the faces of the medium under pressure-supply' tube and the hammer frame feed tube. The packing rings, fitting snugly and tightly against the inner face of the tube 15 and the outer face of the tube 17, furnish a series of abutments, which prevents the com pressed air, orv other medium under pressure, from escaping between the supply tube 17 and the feed and carrying tube 15, with the result that the compressed air, or other medium under pressure, acts yin the chamber 19 -against the end face of the cross head or wall 18 and the closing plug 13, to gradually feed forward thetframe and the head with the bits or cutters, as the head and the bits or cutters operate to drill or bore the hole. It will thus be seen that the medium under pressure, supplied through the tube 17 furnishes the medium for operating thel hammer in the barrel of the frame, and also the medium for feeding forward or advancing the hammer frame, the head with its bits or cutters, and the feed and carrying tube with its conveyer or flight, within which tube the supply tube is located.

The conveyer or non-revoluble outer forms a backing for'the conveyer or flight in the operation of the drill or other tool, and this outer casing or tube 25 has a fixed relation against endwise movement in the construction shown.

It is necessary, in operating the drill or other tool, for various reasons, to withdraw the hammer carrying or conveyer the hammer frame with the pneumatic hammer and the tool, and the present invention utilizes compressed air, or other medium under pressure, for such Withdrawal.

The construction shown has, within and flight is encircled by a tube or casing 25, which tube and tached in place by lag bolts or screws 27, or otherwise, and atv the rear ofthe cross head or abutment 26, and movable within the outer casing or tube 25, is a cross head, piston or abutment 28, having'a neck 29 which threads into the outer end of the carrying tube 15, for the piston and carrying tube to move as one. The head, piston or abutment 28 :has circumferential packing rings 30, so

las to make a tight joint, between the head,

piston or abutment'28 and the' inner face of the outer casing or tube 25, against the esca pc -of the medium under pressure when admitted in the spa-ce between the xedcross head or abutment 26, and the movable cross head, piston or abutment 28 for forcing the latter rearward., TheV movable cross head, piston or abutment is slidable endwise,J or longitudinally, ou therrevoluble supply tube 17, and is connected with such tube by a spline 31 entered into a longitudinal groove 32 in the tube 17, so that thev revolving of the tube 17 will revolve the piston, cross head or abutment 28, and with it the feed" and carrying tube 15, the hammer frame and the .tool in operating the tool. The outer casing or tube 25 has entered thereinto a coupling 33, connected with which is a hose or tube 34, leading to a source of supply for compressed air or other medium under pres.-

sure, for admitting compressed zair, or other medium under pressure, into the space between the fixed cross head or abut-ment 25 and the movable cross head, piston or abutment 28, for` forcing the movable cross head, i piston or abutment rearward to withdraw the,'carrying tube, the hammer frame and th tool.

The rear end of the outer tube or casing 25 is supported onl 'a frame or standard 35,

so as to have a xed relation. to the tube 25.'

This frame or standard 35, in the arrangement shown, consists of a band e encircling the outer casing ortube 25 and having, ,on opposite sides, projecting pins or studs f toenter notches or recesses' g in a support formed of two 'side pieces lai; and the side pieces I1, are connected together at thelower end by a band o'r cross 'head z', extending down from which is a stem j having a sharp point, with grab handles jf for the s tem. The upper end of theside bars z, of thesupport are connectedtogether b a band"or cross head 7c, extending up f o/iii which is a` rod Z, held in the band orcross head k' by a locking screw or' stem c; and the rod Z has its upper end entered into a socket m, and secured by .a locking screw or stem Z', the socket m having a pointed end, as shown in Fiig. .6. The frame or support 35 isheld in a xed position by insertmg or .forcing the i pointed ends of the 'stem jand socket m into the material; vand the height of l the entered thereinto a block or plug 36, secured in place by lag bolts or screws 37, or otherwise, and this head or block 36 has a central axial chamber, encircling the pressure supply tube 17, which chamber 38 receives thereinto the hub 39 of a bevel gear 40, for the gear tol be free to revolve on the head or block as a support. The bevel gear 40 and its .hub has av spline 41, which enters the groove 32 of the supply tube 17, so as to yinterlock the bevel gear with the supply tube for the rotation of the gear to rotate the revoluble supply tube. The bevel gear 40 is driven by a bevel gear or pinion 42 meshing therewith, and the bevel gear or pinion 42 is ixedly secured to a shaft 43, mounted in a box or bearing 44 extending out from the head or block 36, inthe arrangement shown. The shaft 43 is connected with a handle 45 by a pin 46, and the handle 45 has a grip 47, by which thejhandle can be turned to revolve the s'haft'43, and through the bevel gear or pinion 42 rotate the bevel gear 40, and trans mit rotation to the hammer frame, and the tool carried thereby, through the revoluble supply tube and the feed and carrying tube for the hammer frame.

The rear end of the revoluble supply tube 17- has threaded thereonto two rings forming a head 48 and furnishing a circumferential groove 49,- in which is entered a ring 50, which ring has a circumferential passage 51 in its inner face, land this passage 51 is in communication with the interior of the supply ytube 17 by ports or passages 52, so that compressed air, or other medium under press ure, can be supplied to the tube 17 without r interfering with the rotation of ,said tube, as the tube is free to rotate within the ring 49 without disturbing the position of the ring.- The circumferential chamber or passage 5K1 has, leading out therefrom, on one side, a port or passage' 53, into which is entered a coupling 54, to which is connected a hose or other conductor 55,' leading from a source of supply for compressed air,.or otherlmedium under pressure, so as to supply compressed air,or other medium under pressure, to the tube 17, for the air, lor other medium under pressure, to discharge from the tube and feed forward the hammer frame and the tool, and to operate the pneumatic hammer. The construction shown has the rear end of the revoluble supply tube 17 closed by a plate or head 56, xedly attached to the end of the tube by bolts or screws 57, or otherwise, and, as shown, a fixed rod 58, supported at. the rear end against endwise movement by a bumpervn, entered into the material o erated upon or otherwise fixedly held in p ace'wth a bearing-pointp59, abuts against the end head 56, at the center, so as not to interfere with the -rotatio ofthe supply tube 17, and at the same time furnish a backing or support against rearward movement of 'the revoluble supply tube from the vadmission' of the medium under pressure l ticles carried back by with the forward feed in use.

of the closing plug 13,' as already explained;v

and when compressed air, or other medium, is employed for operating the hammer and feeding forward the tool, the air or other- `medium under pressure is shut off from admission between the tubes 15 and 25 and abutments 26 and. 28 so as not to interfere The air, or

- other medium under pressure, is admitted .to the outer tube or casing between the cross wall or abutment 26 and the piston or abutment 28, when it is desired -to employ compressed air, or other medium under pressure, to withdraw the conveyer or flight tube and the hammer frame and tool, and when compressed air, or other medium under pressure, is employed for withdrawing purposes, the air, or other mediumfunder pressure, is shut off fromt-he supply tube 17, so as to not have a resistance furnished by the air or other medium under pressure, against the with.

drawal of the tube, the hammer frame and the tool. v The compressed air, or lother medium under pressure, enters"-the'space between the outer and inner tubes in rear of t-he fixed cross head or abutment 26, so as to press against the front face of the piston rangement ofthe Is1on of the compressed air, orother medium orL movable abutment 28, vand furnish the requisite force or power `to carry vback or withdraw the carrying tube l5`,\the hammer frame and the tool head .and tools, which move as one with the cross head or movable abutment. It will thus be `seen that oomressed air, or other medium under pressure, is utilized, both for operating the tool and for withdrawing the tool when required, and this without any change in the relative arparts, except theadmisunder pressure, to the supply or casing tube,

or to the outer tube, as may be required, for the compressed air, or other medium under pressure, to serve as the power or force for feeding forward and operating the tool, or-

for withdrawing the tool and the parts connected therewith. The cross head or wall 26 constitutes a fixed abutment, while the cross head or piston 2S constitutes a movable abutment, and when the tool has been advanced tothe limit of its operation, the space between the fixed abutment and the movable abutment is corespondingly reduced, so that compressed air, or other medium under ressure, admitted to the space between the xed abutment and the movable abutment, will act againstthe fixed abutment and recede the movable abutment or piston, carrying with it the tube fixed theretofand the hammer frame and tool connected with the tube and withdrawing these parts from the hole made by the tool.

What I claim as new and desire to secure by Letters Patent is: i

Y1. In a feed mechanism for a pneumatic tool, the combination of afixed` outer casing,

a revoluble supply tube located therein for conveying a medium under pressure and held against endwise movement, an abutment secured on the yforward end of the supply tube, a -revoluble endwise movable carrying tube encircling the supply tube and its abutment, means for revolving the carrying tube and `a hammer frame connected with the carrying tube and forming a chamber between its rear end and the abutment of the carrying tube, whereby a medium under pressure, when admitted to the chamber, will act on the end of the frame and feed forward the frame and the carrying tube, substantially as described. e

2. In a feed mechanism for a pneumatic tool, the combination of a fixed-outer casing, a revoluble tube located thereon for conveying a medium .under pressure and having a fixed relation against endwise movement, an

abutment secured on the forward end of the supply tube, a revoluble and endwise movable carrying tube encircling the supply tube, means for revolving the carrying tube, a hammer frame entered into the forward end ofthe carrying tube and forming a chamber between its rear end and the abutment of the supply tube, and a tool carried-by the frame, whereby a medium under pressure admitted to the chamber between the Lend of the frame and the abutment on the supply tube will actuate the tool and feed forward the hammer frame, substantially as described.

3. In a feed mechanism for a pneumatic tool, the combination of a revoluble and endwise movable-tube carryinga hammer frame, afixed outer casing encircling the hammer frame carrying tube, a fixed abutment secured within thc-outer casing, and a piston- `fixed on the hammer frame carrying tube and adapted to slide within the outer casing, whereby a medium under pressure admitted between the fixed abutment and' piston will act against the piston and withdraw the casing, the carrying tube and` the hammer frame, substantially as described.

4. In a feed mechanism for a pneumatic tool, the combination of a revoluble and endwise movable carrying tube, a hammer framc entered onto the forward end of the lca'rr in@ tube a fixed outer casin T encirclin the carrying tube, a tool carried by the hammer frame, a fixed abutment for the outer casing between the casing and the carrying tube, and a piston secured on the outer end of and endwise movable with `the carrying tube and between the tube and the outer casing, whereby a medium under pressure admitted between the abutment and movable piston will act and withdraw the carrying tube, the hammer frame and the tool, substantially as described.

5. In a feed mechanism for a pneumatic tool, the combination of a revoluble supply tube for a medium under pressure and having a fixed relation against endwise movement, an abutment secured on the forward end of the supply tube, a revoluble and endwise movable carrying tube encircling the supply tube, a hammer frame connected tol lthe forward end of the revoluble and endwise movable carrying tube and forming a chamber between its rear end and the abutment of the supply tube, an outer fixed casing, an abutment secured withinthe outer casing between the casing and the carrying tube, and a piston attached to the rear end of the carrying tube, the nrelation of the parts being such that the admission of a medium under pressure to the chamber acts to feed forward the hammer frame yand the admission of a medium under pressure between the abutment of the outer casing and the piston acts to withdraw the hammer frame, substantially as described.

6. In a feed mechanism for a pneumatic tool, the combination of a revoluble supply tube for a. medium under pressure and hav# inga fixed relation against endwise movey ment, an abutment secured on the forward end of the supply tube, a revoluble and endwise movable carrying tube encircling the supply tube, a' hammer frame connected to the forward end of the revoluble and endwise movable carrying tube and forming a chamber between its rear endand the abutment ofthe su ply tube, an operating tool carried by the rame, an outer fixed casing, an abutment secured within the outer casing between the casing and the carrying tube, and a piston attached to the rear end of the 6d carryingtube, the relation of the vparts being such that the admission of a medium under pressure to the chamber acts to feed nforward thehammegs frame and the tool, and the admission of a medium `under pressure between the abutment of the outer casing and the piston acts to withdraw the hammer frame and the tool, lsubstantially as described.

7. In a feed mechanism, for a pneumatic tool, the combinationJ of a revoluble supply tube for a medium under pressure and having a xed relation against endwise movement, an abutment secured on the forward end of the tube, a carrying tube encircling the supply tube, a frame connected to the forward end of the carrying tube and forming. a chamber between vits rear end and the abutment vof the supply tube, an operating tool carried by the frame, an outer caslng surrounding the carrying tube, an abutment secured to the outer casing between the casing and the carrying tube, a piston attached'to the-rear end of the carrying tube, means for supplying a medium under pressure to the chamber at the 'forward end of the carrying tube for the medium under pressure t`o act and feed forward the hammer frame and the tool, and means for admitting medium under pressure between the' abutment on the outer casing and the piston onthe carrying tube for the medium under pressure to act and withdraw the hammer frame and the tool, substantially` as described.

8. In a feed'mechanism for a pneumatic tool, the combination of a tube for supplying a medium under pressure and having a fixed relation against endwise movement, an abutment secured on the forward end of the tube,4 a revoluble and endwise movable l carrying tube encirclingthe supply tube, a 10( hammer frame connected to the forward end of the carrying tube and forming a chaluber between its rear end and the abutment of the supply tube, an outer casing held f against rotation and endwise movement and 10! surrounding the carrying tube, ,a fixed abutment secured on the outer casing, a movable abutment secured on the revoluble and endwise movable carrying tube, both abutments located between the carrying tube and the outer casing, and means for admitting a medium under pressure between the two abutments, substantially as described.

.9. In a feed mechanism for a pneumatlc tool,`the combination of a tube for supplying a medium under pressure and having a fixed relation against cndwise movement, an abutment secured on the forward end of the tube, a revoluble and endwise movable Lcarrying tubel encircling the supply tube, a

hammer frame connected to the forward end of the encircling tubev and forming a chamber between'its rear end and the abutment of the supply tube for the medium under pressure, an outer` casing held against rotation and endwise movement and surrounding the carrying tube, a fixed abutment secured on the outer casing, a movable abut-i ment secured on the revoluble and endwise movable carrying tube, both abutments located between the carrying tube and .the

e outer casing, meansfor supplying a medium under pressure to the chamber at the rear* of the hammer, and means for supplying a medium' under pressure forward of the movable abutment between the outer casing and the carrying tube, substantially as described. 10. In a feed mechanism for a pneumatic tool, the combination of a revoluble and endwise movable carrying tube, a hammer frame yconnected to the forward end of the carrying tube, an outer casing held against rotation and endwise movement and surrounding Ythe carrying tube, a fixed abutment secured onthe outer casing, and a movable abutment on the rear end of the carrying tube, both abutments located between the outer casing and the carrying tube, substantially as described,

.cames 11. Ina .feedmechanism for a neumatic tool, the combination of a revoduble and endwise movablel carrying tube, a hammer frame connected to the forward end of the carrying tube, anI outer casing held against rotation and endwise movement and sur; rounding the carrying tube, a fixed abutment secured on the outer casing, a movable abutment on the rear end of the carrying tube,l both abutments located between the outer casing and the carrying tube, and means for supplying a medium under pressure forward of the movable abutment and between the outer casing and the `carrying tube, substantially as described.

MARTIN HARDSOCG. Witnesses v OSCAR W. BOND, WALKER BANNING. 

